28: Auto Meter-Off (All Modes); 29: Self-Timer (All Modes); 30: Remote On Duration (All Modes); 31: Exp. Delay Mode (All Modes) - Nikon D80 Manual

28: Auto Meter-Off (All Modes)
Choose how long the camera continues to meter exposure when no
operations are performed (the default setting is 6 s). Choose a shorter
meter-off delay for longer battery life. Regardless of the setting chosen,
the exposure meters remain on for ten minutes when the camera is
powered by an optional EH-5 AC adapter.

29: Self-Timer (All Modes)

Choose the length of the shutter-release delay in self-timer mode (
37). The default setting is 10 s.

30: Remote On Duration (All Modes)

Choose how long the camera will wait for a signal from the remote
before cancelling delayed or quick-response remote modes ( 38).
Choose shorter times for longer battery life. The default setting is one
minute.

31: Exp. Delay Mode (All Modes)

Select On to delay shutter release until about 0.4 s after the shutter-
release button is pressed, reducing camera shake in situations in which
the least camera movement could result in blurred photographs (for
example, microscope photography). The default option is Off .
Menu Guide / Custom Settings 99